Off course i'll not give this information for the empire cokroaches without telling the antidote to the Rebells
Bikes are cheap in Unit capacity and the Empire bikers are much better than they're rebel counterparts. A lv4 empire bike is like a lv7 rebel bike. A bunch of bikes will go out crazy and kill a rebell hero in seconds. As rebell attacks tend to be massively of infantry, a bunch of bikes have already ended prematurely may attack many times. Not anymore... Yesterday i just killed 5 bikes from an SC the easy way. The cheapest solution for those who already are at level 8 is to carry always 2 twileks. I invite those bikers for a ride by sending a HOG rally invitation (usually a trooper or a bantha or a pig, wichever cheapest solution that will activate the SC), then i simply put 2 twileks upon them. They will kill them fast and be blown together. it will cost me 1+1 +4+4 units to do it, but if they kill 2-3 of my jets it would be 21 units
Another solution even cheaper is to call them outside and put Luke outside for them. They will try to kill him like mad but if you turn on the light saber, you get time enough to put those heavyes or jets arround the bikes and finish the job. If there are 2 or more bikes, don't try to do it with Leia and medical droids becouse it is not as guaranteed as it is with a sentinel droideka, specially if there are a bunch of bikes.
those are nasty under shields. luckily they are a bit weaker than the Rebel counterparts, but deadly as the rebels use lots of infantry. I usuall call them outside with the above described method and when they are locked in the search of that slowly walking rebel trooper outside i just trow some troops in the middle of they're way. the problem is that they walk slowly too and that will consume your time, so be smart and start attacking other places concomitantly or X-wing/hwk them as soon as they are out of shielding becouse it doesn't matter if there are one or 4 snipers there, they probably are going to walk together and ease your one shot all kill.
Sometimes we find that monster in lv 8 bases and up inside as it is versatile to attack and defend. That crap will kill a jug in seconds, decimate your droideka and kill your hero in seconds. That is a problem that starts at level8 and the solution starts at lv8 too and it is called Luke Skywalker. Just start using the light saber to distract the monster and pray for the rest of the attacking troops take care of him at time. Airsupport is desired as soon as you see it, becouse if Luke gets tired of using the light saber...
-At-Dp: that's another MTF SOfABtx. specially at lv9 and above as they are a bit overrated in health. Luke with the saber is your friend too or give him a gamorrean to eat whyle ou try to kill him. Anti infantry troops and skiffs are a good idea. If you have them in your Sc, don't hesitate to release them before it is too late.
Hope i have helped!